package com.suo.service;

import com.suo.mapper.LoginTicketMapper;
import com.suo.mapper.UserMapper;
import com.suo.pojo.LoginTicket;
import com.suo.pojo.User;
import com.suo.utils.CommunityConstant;
import com.suo.utils.CommunityUtil;
import com.suo.utils.MailClient;
import com.suo.utils.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.util.*;
import java.util.concurrent.TimeUnit;

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;

    @Autowired
    private MailClient mailClient;

    @Autowired
    private TemplateEngine templateEngine;

    @Autowired
    private RedisTemplate redisTemplate;

//    @Autowired
//    private LoginTicketMapper loginTicketMapper;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    public User findUserById(int id) {
//        return userMapper.selectById(id);
        User user = getCache(id);
        if(user == null) {
            user = initCache(id);
        }
        return user;
    }

    public Map<String,Object> register(User user){
        Map<String,Object> map = new HashMap<>();

        // 空值处理
        if(user == null) {
            throw new IllegalArgumentException("参数不能为空");
        }
        if(StringUtils.isBlank(user.getUsername())) {
            map.put("usernameMsg","账户不能为空");
            return map;
        }
        if(StringUtils.isBlank(user.getPassword())) {
            map.put("passwordMsg","密码不能为空");
            return map;
        }
        if(StringUtils.isBlank(user.getEmail())) {
            map.put("emailMsg","邮箱不能为空");
            return map;
        }

        // 验证账号
        User user1 = userMapper.selectByName(user.getUsername());
        if(user1 != null) {
            map.put("usernameMsg","该账号已存在");
            return map;
        }

        // 验证邮箱
        User user2 = userMapper.selectByEmail(user.getEmail());
        if(user2 != null) {
            map.put("emailMsg","该邮箱已存在");
            return map;
        }

        // 注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0,5));
        user.setPassword(CommunityUtil.md5(user.getPassword() + user.getSalt()));
        user.setType(0);
//        user.setStatus(0);
        user.setStatus(1);
        user.setActivationCode(CommunityUtil.generateUUID());
        user.setHeaderUrl(String.format("https://images.nowcoder.com/head/%dt.png",new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);

//        // 激活邮件
//        Context context = new Context();
//        context.setVariable("email",user.getEmail());
//        String url = domain + contextPath + "/activation/" + user.getId() + "/" + user.getActivationCode();
//        context.setVariable("url",url);
//        String content = templateEngine.process("/mail/activation",context);
//        mailClient.sendMail(user.getEmail(),"激活账户",content);

        return map;
    }

    public int activation(int userId, String code) {
        User user = userMapper.selectById(userId);
        if(user.getStatus() == 1) return CommunityConstant.ACTIVATION_REPEAT;
        else if (code.equals(user.getActivationCode())) {
            userMapper.updateStatus(userId, 1);
            clearCache(userId);
            return CommunityConstant.ACTIVATION_SUCCESS;
        }
        else return CommunityConstant.ACTIVATION_FAILURE;
    }

    public Map<String, Object> login(String username, String password, int expiredSeconds) {
        Map<String,Object> map = new HashMap<>();

        // 空值处理
        if(StringUtils.isBlank(username)) {
            map.put("usernameMsg", "账号不能为空!");
            return map;
        }
        if(StringUtils.isBlank(password)) {
            map.put("passwordMsg", "密码不能为空!");
            return map;
        }

        // 验证账号
        User user = userMapper.selectByName(username);
        if(user == null) {
            map.put("usernameMsg", "该账号不存在!");
            return map;
        }

        // 验证密码
        password = CommunityUtil.md5(password + user.getSalt());
        if (!user.getPassword().equals(password)) {
            map.put("passwordMsg", "密码不正确!");
            return map;
        }

        // 验证状态
        if (user.getStatus() == 0) {
            map.put("usernameMsg", "该账号未激活!");
            return map;
        }

        // 生成登录凭证
        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis() + expiredSeconds * 1000));

//        loginTicketMapper.insertLoginTicket(loginTicket);
        String redisKey = RedisKeyUtil.getTicketKey(loginTicket.getTicket());
        redisTemplate.opsForValue().set(redisKey, loginTicket);

        map.put("ticket", loginTicket.getTicket());
        return map;

    }

    public void logout(String ticket) {
//        loginTicketMapper.updateStatus(ticket, 1);
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        LoginTicket loginTicket = (LoginTicket) redisTemplate.opsForValue().get(redisKey);
        loginTicket.setStatus(1);
        redisTemplate.opsForValue().set(redisKey, loginTicket);
    }


    public LoginTicket findLoginTicket(String ticket) {
//        return loginTicketMapper.selectByTicket(ticket);
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        return (LoginTicket) redisTemplate.opsForValue().get(redisKey);
    }


    public void updateHeader(int id, String headerUrl) {
        userMapper.updateHeader(id,headerUrl);
        clearCache(id);
    }

    public int updatePassword(int id, String password) {
        int rows = userMapper.updatePassword(id,password);
        clearCache(id);
        return rows;
    }

    public User findUserByName(String username) {
        return userMapper.selectByName(username);
    }

    // 1.优先从缓存中取值
    private User getCache(int userId) {
        String redisKey = RedisKeyUtil.getUserKey(userId);
        return (User) redisTemplate.opsForValue().get(redisKey);
    }

    // 2.取不到时初始化缓存数据
    private User initCache(int userId) {
        User user = userMapper.selectById(userId);
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.opsForValue().set(redisKey, user, 3600, TimeUnit.SECONDS);
        return user;
    }

    // 3.数据变更时清除缓存数据
    private void clearCache(int userId) {
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.delete(redisKey);
    }

    public Collection<? extends GrantedAuthority> getAuthorities(int userId) {
        User user = this.findUserById(userId);

        List<GrantedAuthority> list = new ArrayList<>();
        list.add(new GrantedAuthority() {

            @Override
            public String getAuthority() {
                switch (user.getType()) {
                    case 1:
                        return CommunityConstant.AUTHORITY_ADMIN;
                    case 2:
                        return CommunityConstant.AUTHORITY_MODERATOR;
                    default:
                        return CommunityConstant.AUTHORITY_USER;
                }
            }
        });
        return list;
    }
}
